More likely, and perhaps even more fun, would be a moon that was almost in geosynchronous orbit. What would be the effect on civilization and the biosphere if i

More likely, and perhaps even more fun, would be a moon that was almost in geosynchronous orbit. What would be the effect on civilization and the biosphere if instead of 1 meter tides with a 12 hr period we had 100 meter tides with a 100 year period?